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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6288c3b6c46bb4b96f3f5c09b5c42a64bf4acc95b11b73a9e070265136d552' 
  AND token = 'oChx89xJ7PrNXyd9PhzHxGRJytET2Y/IZySJO3ARnJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}